The purpose of path loss modeling is to predict signal fading in various environments, which crucial for planning, deployment, and optimization mobile networks. Existing prediction methods based on machine learning have poor generalization at sparse measurement areas, most require 3D information about the environment or specific parameters base station. We propose Meta-PL, a model Meta-Learning, infer strength areas. method divides research area into multiple grids uniform size, each grid as...

This letter presents a novel broadband single-lossy-single-lossless-layer frequency selective rasorber (FSR) with high passband selectivity, facilitated by an enhanced equivalent circuit model (ECM). Leveraging the ECM method for FSR substituting typical LC resonant circuits mixed series-parallel LCL both lossy and lossless FSSs, significantly enhances selectivity. The intentionally introduced inductance in FSS sharpens roll-off, while creates additional transmission zero, further improving...

An ultrawideband frequency selective surface (FSS) absorber with high angular stability and polarization independency applied in a microwave band is proposed. The composed of three identical Teflon layers dual FSS distinct patterns. miniaturized FSSs unique patterns demonstrate advantages facile manipulation the impedance multiple resonances an ultrawide range. use dielectric substrate greatly reduces complexity design, compared conventional way that requires variable constants for...

The relationship between the distribution of 4 He and pattern groundwater flow within Jurassic aquifer Great Artesian Basin has been a source controversy. According to one explanation, large possibly heterogeneous flux helium passes from crystalline crust into basin strata, accumulating in flowing through aquifer. A second explanation holds that contrary current understanding basin's hydrology, is stagnant, allowing produced situ accumulate over geologic time. We use numerical model study...

Abstract Owing to excellent performance and a simple mechanism, stretchable piezoresistive strain sensors have been applied human skin for monitoring physical activities, physiological etc. However, it is still challenge simultaneously realize highly sensitive with high optical transparency. This study reports transparent sensor 2D surface buckling by fabricating ultrathin indium tin oxide (ITO) film on the biaxially pre‐stretched polyacrylate (VHB) elastomer followed pre‐stretch releasing....

Abstract An optically transparent and angularly stable frequency selective surface (FSS) with a broad stopband is introduced for addressing millimeter wave (mmW) electromagnetic interference. The unique FSS unit cell pattern incorporates cross patch Y‐shaped branches, effectively broadening the bandwidth enhancing angular stability. Utilizing conductive indium tin oxide deposited on both sides of glass substrate enables to reflect absorb waves. Consequently, proposed exhibits an...

Abstract Electromagnetic exposure caused by mobile communication signals has always been a cause of concern. Due to the cost and inconvenience professional measurement equipment, researchers have turned smartphone APPs study assess electric field strength signals. However, existing cell phone‐based measurements two weaknesses. First, no system architecture suitable for large‐scale crowdsourced testing proposed. Second, since sensors cannot measure directly, methods converting received signal...

A compact dual-band patch antenna is proposed and measured in this paper. The employs a U-shaped slot two mitered corners to achieve operating frequency bands, 2:30 » 2:50GHz 4:50 6:36GHz, which meet the speciflcations of IEEE 802.11b/g/a standard for WLAN applications. Full wave analysis performed simulate characteristics using CST microwave studio. Moreover, fabricated prototype has dimensions 20:0mm£25mm£1mm exhibits agreement between simulated parameters radiation patterns.

Metallic films with subwavelength apertures, integrated into a semiconductor by metal-assisted chemical etch (MacEtch), demonstrate enhanced transmission when compared to bare surfaces. The resulting "buried" metallic structures are characterized spectroscopically and modeled using rigorous coupled wave analysis. These composite materials offer potential integration optoelectronic devices, for simultaneous near-uniform electrical contact strong optical coupling free space.

In this article, a method for representing electromagnetic emissions from device under test (DUT) using an equivalent time dependent dipole array model deduced the time-domain near-field scanned tangential magnetic fields is proposed. First, three-dimensional (3-D) scanning system established to measure emitted DUTs which are transmission line above ground plane and printed circuit board (PCB) with several microstrips, respectively. For measurements, two field probes calibrated over broad...

Research Article| April 01, 1998 Controls on the distribution and isotopic composition of helium in deep ground-water flows Xiang Zhao; Zhao 1Department Geology, University Illinois at Urbana-Champaign, Urbana, 61801 Search for other works by this author on: GSW Google Scholar Theresa L. B. Fritzel Hernán; Hernán A. M. Quinodoz; Quinodoz Craig Bethke; Bethke Thomas Torgersen 2Department Marine Science, Connecticut, Groton, Connecticut 06340 Author Article Information Publisher: Geological...

A novel microwave (MW) rectifier based on a diode array is presented in this paper. The composed with sixteen HSMS-282 Schottky diodes applied to enhance the MW input power. proposed configuration improves power capacitance from 20 dBm level of single-diode up 30 level. design use replace single without significant modification original rectifying circuit. When between 23 and 33 load at hundred Ohm level, direct current (MW-DC) conversion efficiency above 60% realized. DC output voltage...

Sensors based on Fano resonance (FR) have become a promising platform for various biological and chemical applications. However, most investigations FR are limited to the generation of individual resonance. In this paper, coupling between surface plasmon polariton (SPP) two photonic waveguide modes, dual-FR system is designed analyzed. To explain mechanism, an extended temporal coupled-mode model established provide physical insight. The spectral response obtained from matches well with...

A planar triple-band monopole antenna with a U-shaped stripline and L slot is presented. The very compact size of 20 £ 30 1:5mm 3 fed by 50› microstrip line defected ground. measured i10dB impedance bandwidth the proposed covers 2.33GHz{2.51GHz, 3.25GHz{3.82GHz, 4.83GHz{8.4GHz, respectively, which meets speciflcations WLAN 2.4/5.2/5.8GHz WiMAX 3.5/5.5GHz. radiation characteristics shows monopole-like pattern, results are in agreements simulated ones.

Microwave devices based on high-power magnetrons are currently used widely and there is a strong demand for phase-controlled magnetrons. In this work, the performance of 20-kW S-band continuous-wave magnetron with varied anode voltage ripple studied. The introduced to an equivalent model evaluate system's theoretically. effects injection parameters magnetron's output thus analyzed numerically. Furthermore, experiments performed while from 4.2% 0.6% using shunt capacitance-adjustable filter...

A distinctive frequency selective surface (FSS) to effectively enhance the electromagnetic shielding performance of high-speed electronic systems while preserving good mechanical ventilation is proposed in this article. The FSS consists periodic segmented circular patterns two-dimensional view and hollow vent holes spatial, which exhibits a wide 2 GHz stopband at interested 28 GHz. new design also demonstrates stability wave oblique incidence polarization. panel prototyped measured for...

A novel single-feed circularly polarized antenna array is constructed by a 2 × of four square linear microstrip patches with orthogonal orientation and phase shift 90° in between. The sequential rotation suitable phasing improve the radiation pattern symmetry input impedance matching antenna. metamaterial transmission line designed applied to feeding array. works at its zeroth order resonant mode there no between output ports. 5.8 GHz built demonstrated, which fed line. compact whole...

In this paper, we propose an alternative semianalytical solution to problems of field-to-wire coupling in electrically large cavity employing a different method derivation. This model is based on transmission-line (TL) theory and the plane wave integral representation for fields as well statistical properties well-stirred reverberation chamber. Compared earlier which sum double integrals over length and/or height TL, also but solid angle. one, some terms were neglected due simplification,...

Stochastic transmission line (TL) analysis is often challenging due to the difficulty of fully identifying probability distributions all randomly varying parameters, especially in presence noise. These problems cannot be directly addressed by existing polynomial chaos expansion (PCE) framework. To overcome limitations, this article proposes an improved PCE method for analyzing stochastic TL model with A regression-based nonintrusive approach termed least squares regression (LSPCR) employed...